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Note 13 - Equity Incentive Plan (Tables)

12 Months Ended

Dec. 31, 2015

Notes Tables

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

		December 31,
		2015				2014				2013
Risk free interest rate		1.15%	-	1.46%		1.16%	-	1.39%		0.61%	-	1.02%
Expected volatility		53.15%	-	54.65%		53.28%	-	57.05%		53.60%	-	57.60%
Expected life (years)			4.5				4.0				4.0
Expected dividend yield			0.00%				0.00%				0.00%

Schedule of Share-based Compensation, Stock Options and Stock Appreciation Rights Award Activity [Table Text Block]

		2015								2014
		Number of Shares				Weighted Average Exercise Price Per Share				Number of Shares				Weighted Average Exercise Price Per Share
Options and SAR's outstanding at beginning of year			851,287			$	14.85				1,513,326			$	9.14
Granted			111,625			$	39.25				179,240			$	35.62
Cancelled			(85,349	)		$	19.77				(53,325	)		$	23.73
Expired			(8,825	)		$	20.03				(24,292	)		$	9.87
Exercised			(106,478	)		$	10.96				(763,662	)		$	7.95
Options and SAR's outstanding at end of year			762,260			$	18.75				851,287			$	14.85

Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]

		2015								2014
		Number of Shares				Weighted Average Grant Date Fair Value				Number of Shares				Weighted Average Grant Date Fair Value
Nonvested at Beginning of year			109,614			$	23.91				79,591			$	11.93
Granted			81,080			$	37.84				60,098			$	32.02
Cancelled			(10,635	)		$	32.02				(7,500	)		$	25.46
Expired			-			$	-				-			$	-
Vested/Released			(29,675	)		$	19.31				(22,575	)		$	10.01
Nonvested at end of year			150,384			$	34.29				109,614			$	23.91

X

- Definition

Tabular disclosure of the changes in outstanding nonvested restricted stock units.

+ References

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-Name Accounting Standards Codification
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+ References

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+ References

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